aboutsummaryrefslogtreecommitdiffstats
path: root/net/xmppserver_listener.lua
blob: 8a3886adf3b9d38d71b6b9c36ebe87294056e1cc (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
-- Prosody IM
-- Copyright (C) 2008-2009 Matthew Wild
-- Copyright (C) 2008-2009 Waqas Hussain
-- 
-- This project is MIT/X11 licensed. Please see the
-- COPYING file in the source package for more information.
--



local logger = require "logger";
local log = logger.init("xmppserver_listener");
local lxp = require "lxp"
local init_xmlhandlers = require "core.xmlhandlers"
local s2s_new_incoming = require "core.s2smanager".new_incoming;
local s2s_streamopened = require "core.s2smanager".streamopened;
local s2s_streamclosed = require "core.s2smanager".streamclosed;
local s2s_destroy_session = require "core.s2smanager".destroy_session;
local s2s_attempt_connect = require "core.s2smanager".attempt_connection;
local stream_callbacks = { default_ns = "jabber:server",
		streamopened = s2s_streamopened, streamclosed = s2s_streamclosed, handlestanza =  core_process_stanza };

local xmlns_xmpp_streams = "urn:ietf:params:xml:ns:xmpp-streams";

function stream_callbacks.error(session, error, data)
	if error == "no-stream" then
		session:close("invalid-namespace");
	elseif error == "parse-error" then
		session.log("debug", "Server-to-server XML parse error: %s", tostring(error));
		session:close("xml-not-well-formed");
	elseif error == "stream-error" then
		local condition, text = "undefined-condition";
		for child in data:children() do
			if child.attr.xmlns == xmlns_xmpp_streams then
				if child.name ~= "text" then
					condition = child.name;
				else
					text = child:get_text();
				end
				if condition ~= "undefined-condition" and text then
					break;
				end
			end
		end
		text = condition .. (text and (" ("..text..")") or "");
		session.log("info", "Session closed by remote with error: %s", text);
		session:close(nil, text);
	end
end

local function handleerr(err) log("error", "Traceback[s2s]: %s: %s", tostring(err), debug.traceback()); end
function stream_callbacks.handlestanza(a, b)
	xpcall(function () core_process_stanza(a, b) end, handleerr);
end

local connlisteners_register = require "net.connlisteners".register;

local t_insert = table.insert;
local t_concat = table.concat;
local t_concatall = function (t, sep) local tt = {}; for _, s in ipairs(t) do t_insert(tt, tostring(s)); end return t_concat(tt, sep); end
local m_random = math.random;
local format = string.format;
local sessionmanager = require "core.sessionmanager";
local sm_new_session, sm_destroy_session = sessionmanager.new_session, sessionmanager.destroy_session;
local st = require "util.stanza";

local sessions = {};
local xmppserver = { default_port = 5269, default_mode = "*a" };

-- These are session methods --

local function session_reset_stream(session)
	-- Reset stream
		local parser = lxp.new(init_xmlhandlers(session, stream_callbacks), "\1");
		session.parser = parser;
		
		session.notopen = true;
		
		function session.data(conn, data)
			local ok, err = parser:parse(data);
			if ok then return; end
			(session.log or log)("warn", "Received invalid XML: %s", data);
			(session.log or log)("warn", "Problem was: %s", err);
			session:close("xml-not-well-formed");
		end
		
		return true;
end

local stream_xmlns_attr = {xmlns='urn:ietf:params:xml:ns:xmpp-streams'};
local default_stream_attr = { ["xmlns:stream"] = "http://etherx.jabber.org/streams", xmlns = stream_callbacks.default_ns, version = "1.0", id = "" };
local function session_close(session, reason, remote_reason)
	local log = session.log or log;
	if session.conn then
		if session.notopen then
			session.sends2s("<?xml version='1.0'?>");
			session.sends2s(st.stanza("stream:stream", default_stream_attr):top_tag());
		end
		if reason then
			if type(reason) == "string" then -- assume stream error
				log("info", "Disconnecting %s[%s], <stream:error> is: %s", session.host or "(unknown host)", session.type, reason);
				session.sends2s(st.stanza("stream:error"):tag(reason, {xmlns = 'urn:ietf:params:xml:ns:xmpp-streams' }));
			elseif type(reason) == "table" then
				if reason.condition then
					local stanza = st.stanza("stream:error"):tag(reason.condition, stream_xmlns_attr):up();
					if reason.text then
						stanza:tag("text", stream_xmlns_attr):text(reason.text):up();
					end
					if reason.extra then
						stanza:add_child(reason.extra);
					end
					log("info", "Disconnecting %s[%s], <stream:error> is: %s", session.host or "(unknown host)", session.type, tostring(stanza));
					session.sends2s(stanza);
				elseif reason.name then -- a stanza
					log("info", "Disconnecting %s->%s[%s], <stream:error> is: %s", session.from_host or "(unknown host)", session.to_host or "(unknown host)", session.type, tostring(reason));
					session.sends2s(reason);
				end
			end
		end
		session.sends2s("</stream:stream>");
		if session.notopen or not session.conn:close() then
			session.conn:close(true); -- Force FIXME: timer?
		end
		session.conn:close();
		xmppserver.ondisconnect(session.conn, remote_reason or (reason and (reason.text or reason.condition)) or reason or "stream closed");
	end
end


-- End of session methods --

function xmppserver.onincoming(conn, data)
	local session = sessions[conn];
	if not session then
		session = s2s_new_incoming(conn);
		sessions[conn] = session;

		-- Logging functions --

		
		local conn_name = "s2sin"..tostring(conn):match("[a-f0-9]+$");
		session.log = logger.init(conn_name);
		
		session.log("info", "Incoming s2s connection");
		
		session.reset_stream = session_reset_stream;
		session.close = session_close;
		
		session_reset_stream(session); -- Initialise, ready for use
		
		session.dispatch_stanza = stream_callbacks.handlestanza;
	end
	if data then
		session.data(conn, data);
	end
end
	
function xmppserver.onstatus(conn, status)
	if status == "ssl-handshake-complete" then
		local session = sessions[conn];
		if session and session.direction == "outgoing" then
			local format, to_host, from_host = string.format, session.to_host, session.from_host;
			session.log("debug", "Sending stream header...");
			session.sends2s(format([[<stream:stream xmlns='jabber:server' xmlns:db='jabber:server:dialback' xmlns:stream='http://etherx.jabber.org/streams' from='%s' to='%s' version='1.0'>]], from_host, to_host));
		end
	end
end

function xmppserver.ondisconnect(conn, err)
	local session = sessions[conn];
	if session then
		if err and err ~= "closed" and session.srv_hosts then
			(session.log or log)("debug", "s2s connection attempt failed: %s", err);
			if s2s_attempt_connect(session, err) then
				(session.log or log)("debug", "...so we're going to try another target");
				return; -- Session lives for now
			end
		end
		(session.log or log)("info", "s2s disconnected: %s->%s (%s)", tostring(session.from_host), tostring(session.to_host), tostring(err or "closed"));
		s2s_destroy_session(session, err);
		sessions[conn]  = nil;
		session = nil;
	end
end

function xmppserver.register_outgoing(conn, session)
	session.direction = "outgoing";
	sessions[conn] = session;
	
	session.reset_stream = session_reset_stream;
	session.close = session_close;
	session_reset_stream(session); -- Initialise, ready for use
	
	--local function handleerr(err) print("Traceback:", err, debug.traceback()); end
	--session.stanza_dispatch = function (stanza) return select(2, xpcall(function () return core_process_stanza(session, stanza); end, handleerr));  end
end

connlisteners_register("xmppserver", xmppserver);


-- We need to perform some initialisation when a connection is created
-- We also need to perform that same initialisation at other points (SASL, TLS, ...)

-- ...and we need to handle data
-- ...and record all sessions associated with connections